Abstract：In order to characterize the mechanical behaviour of 9CrMoWV heat-resistant steel during practical use, the stress rupture test was carried out under different temperatures and stress conditions. The stress rupture specimens were observed by OM, SEM and TEM. The effects of different temperatures, stresses and durations on the microstructure, macro and micro fracture of 9CrMoWV heat-resistant steel were analyzed. At the same time, the size change of Laves phase and the distribution of other second phase were counted and analyzed. The results showed that with the increase of test time and temperature, the dimple size of fracture surface increased, the recovery degree of lath martensite increased, and the size of Laves phase changed obviously. M23C6 and Laves phase distributed in the grain boundary were coarsened in varying degrees, which was one of the reasons for the fracture of samples in high temperature and low stress zone.
张海伟. 9CrMoWV耐热钢的高温持久蠕变性能及组织行为研究分析[J]. 中国冶金, 2021, 31(12): 55-60.
ZHANG Hai-wei. Study on creep rupture properties and microstructure behavior of 9CrMoWV heat-resistant steel at high temperature[J]. China Metallurgy, 2021, 31(12): 55-60.
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2021, Vol. 31 
